Well said, about how dangerous it would be to have solid tires, U may only ocasionaly go on the street, but it would only take one time to realize just how bad that would be, With all the types of run flats and all the types of addatives to fix a flat on the road while driving, All the enginering to accomplish what a solid tire would do, if they worked at all it would already have been done....There are many reasons solid tires are only found on forklifts and the like,I run the same slime stuff in my forklift and my M38, it is the stuff that is inbetween the just high speed road stuff and the super thick big equipment stuff, it says it will imedietly clog a 1/4 inch hole immediatly. I suppose it workes, no flats on my lift in 5 years and im a carpenter contractor, and the M38 also has not had a flat, I have had slow leaks in other vehicles but not them, Randy